Electrical ignition apparatus for internal-combustion engines



F. BILLON. 'ELECTRICAL IGNITION APPARATUS FOR INTERNAL COMBUSTIONENGINES.

- APPLICATION FILED FEB. I3 I918.

1,386,23 1. Patented Aug. 2, 1.921.

2 SHEETSSHEET I.

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FQBILLON. ELECTRICAL IGNITION APPARATUS FOR tNTERNAL COMBUSTION ENGINES.

v APPLICATION FILED FEB. 13, 1918.

Patented Aug. 2, 1921.

2 SHEETS-SHEET 2 INVENTUR Ffii/llam BY /P,/dyw&fi1

ATTORNEY UNITED STATES PATENT OFFICE.

FBEDERIC BILLON, OF'SOLOTHUTRN, SWITZERLAND.

i ELEJTBIOAL rcm'rron arraaarus FOR INTERNAL-communion micmns.

Specification of Letters I 'atent.

Patented Aug. 2, 1921.

Application'flled February 13, 1918. Serial No. 216,905.

In'i ition a paratus of the kind speciw fied in atent 0. 1,361,133granted December 7th, 1920, the weight of the rotor is perfectlybalanced from a dynamic point of view. In some constructions accordingto .the said patent, the static balance'however can be produced only bythe use of special counterweights.

The present invention allows of producing a balance of the weight bothstatically and dynamically without the use of special counterweights inconnection with the rotor of the ignition apparatus. This is effectedaccording to the present invention by a pcculiar formation of the partsthat constitute the magnetic circuit of the apparatus. This improvedformation consists .in arranging the pole pieces of a pole both asregards the fixed portion as well as the rotary portion, in two groupsin the axial direction side by side with a gap between, while thecorresponding pole pieces of the other pole are not so subsdivided andare arranged opposite to this gap.

This improved arrangement allows the masses of both the rotor and thestator to be distributed symmetrically in a complete manner to a centralplane in the direction of the axis, and at the same time alsosymmetrical to a plane at right angles to the axis, so that the massesare balanced dynamically as well as statically.

This same arrangement allows of having always 'on both sides equaloverlapping of the pole pieces, so that the magnetic forces are equallybalanced.

Two constructional examples of this invention are illustrated in thedrawings.

Figure 1 illustrates perspective views of the two sides of the stator,with projecting double poles on one side thereof and a single pole onthe opposite side, all provided with concave faces.

' Fig. 2 is a slmilar view of the correspondingrotorwith bifurcated polepieces, consistlng of a permanent magnet. Fig. 3 illustrates a crosssection through 'the yokes and the rotor in their assembled condition.

Figs. 4. and 5 illustrate diagrammatically the mutually opposite polesurfaces of the yoke and the rotor in different relative posit ons, indeveloped views, showin the positions of the rotor in which the uxpasses through the zeropoint.

Figs. 6 to 10 illustrate a-modified constructional form, in which- IFig. 6 shows in perspective views of the two sides of the yoke; Fig. 7shows a cross section through the parts of" the yoke and the rotor intheir assembled condition, and

Fig. '8 the. corresponding rotor;

Figs. 9 and 10 are diagrammatic views of. opposite pole surfaces of theyoke and therotor in different relative positions,-in developed views,showin the positions of the rotor in which the ux passes through thezero point.

In both constructions the stationary ortion of the magnetic circuit isconstitute by a yoke that carries the induction winding, while therotary portion consists of a permanent magnet. I

Referring to Figs. 1 to 5, v

Fig. 1 shows the two side members of the yoke formed with projectingpoles. One side member of the yoke is s lit in such a manner that thetwo portions and B thereof have a gap between them. Opposite this ga isarranged the pole piece C of the other si e member of the yoke. Fig. 2shows the rotor in which the yoke members formed by suitable recesses inthe cylindrical periphery of the magnet, arearranged in an analogousmanner. In this rotor the pole pieces N-are subdivided into two groups.Opposite the gap situated between the two groups there are arranged thepole pieces S of the other pole.

The positions of the pole pieces A and B of the fixed the positions andS of the rotor, are illustrated respectively in Figs. 4 and 5 which iare developed views showing those positions of the rotor in which theflux passes through Eortion or stator relatively to the zero point, andthe igniting spark is produced.

The position shown in Fig. 4 corresponds to the position of the rotorshown in;Fig. 3 in which the N-plple is leaving the stationary portionsA and and the S-pole is leaving the stationary portion C on the yoke.

Fig. 5 shows the position which is reached after about half arevolution, in which the S-pole is leaving the portions A and B, andtheN-pole is leaving the portion C 0n the stator.

A comparison of the position, for example, of the N-pole in Fig. 4, withthe position shown in Fig. 5, shows thatin one revolution two ignitionsare produced at angular distances apart of 180 g and 180 5 By suitableformation and dimensions of the projections or recesses of the polepieces,

the angle 2 and consequently the time-interval between two successiveignitions may be chosen to suit the angle a of the cylinders of theinternal combustion engine.

In the constructional form of the improved ignition apparatusillustrated in Figs. 6 to 1.0, the rotor has projecting pole pieces,while the pole pieces of the stator are formed by recesses.

Figs. 6 to 10 correspond respectively with Figs. 1 to 5, andthe euivalent parts are marked with the same re erence letters as in the lastmentioned figures.

What I claim is v "In an electrical ignition apparatus for an internalcombustion engine, for producing any desired time-succession of theignitions the combination of a stator of which one pole piece issubdivided so as to form two groups of pole tips, said groups beinglocated axially side by side, but separated by a gap, and a rotor ofwhich one pole piece is subdivided so as to form two groups of poletips, said groups being located axially side by side, but separated by agap, while the pole pieces of the other pole of both said stator andsaid rotor are located respectively opposite said gaps.

In testimony whereof I have signed my name to this specification.

FREDERIC BILLON.

